In order to meet the requirement of the ultra-wide angle and large view landscape, a compact structure fisheye lens system for the sport digital video is designed with the optical system design software CODE V and Zemax. The lens comprises 5 pieces of glass lenses and 3 pieces of plastic aspheric lens. The design result shows that the F-number is 2.2, field angle is 240°, the total length of the system is 23 mm, the half image height is 2.35 mm, and all of the field of view at half of Nyquist frequency (178 Lp/mm) are more than 0.15. The lens achieve high-resolution panoramic monitor. The projection detection result shows that the performance of the fisheye lens can meet the requirements.